Upper Control Arm Mistakes on a Tacoma or 4Runner (2026)
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The most common upper control arm mistake is buying for the wrong job: an SPC for hard, fast wheeling, or a uniball arm for a daily driver you'll never maintain. After that, it's taking the truck to a regular tire shop for the alignment, ignoring wheel backspacing, and letting ball joints and uniballs go dry.
So, I sat down with Hugo at Runnin4Tacos in Denver and lined up pretty much every popular upper control arm for the Tacoma and 4Runner on one table: SPC, ICON, JBA, Dirt King, Total Chaos, Camburg and Dobinsons. Here's what separates them, and the mistakes that cost people money.
Which UCA is built for what
| Type | Examples | Best for | Watch out for |
|---|---|---|---|
| Adjustable ball joint | SPC | Daily driver, light trails, getting alignment back to spec with bigger tires | Not tubular, so not as strong |
| Tubular, replaceable ball joint | Dobinsons tubular, Dirt King, JBA standard duty | Entry level. Parts you can find at an auto parts store | JBA needs the right wheel backspacing |
| Tubular, sealed Delta Joint | ICON tubular | Low maintenance with uniball-type strength | Delta joints are harder to find |
| Tubular, uniball | Total Chaos, Camburg | Heavy trucks, aggressive and faster wheeling | Needs regular lube and greasing |
| Billet or heim, adjustable | Dobinsons billet, ICON billet, Camburg billet, Total Chaos heim | Saving weight and adding adjustability | Expensive. Aluminum is lighter, not stronger |
Mistake 1: Buying an SPC to beat on
The SPC was my first upper control arm, and it's a lot of people's first. The reason why is adjustability. SPC has a patented ball joint you can adjust, so you can fix caster and camber at the same time. That makes it a great arm if you're going to bigger tires and want your alignment back to spec. It's quiet too, because its pivot is a blend of a heim joint and a rubber bushing.
But keep in mind, SPC is an alignment company, not an off-road company. It's not a tubular arm like the others, so it's not as strong. Hugo's take was that it's perfect for a daily driver or a weekend warrior who's conservative on the trails. If you like to go fast and hit things harder than you should, get a tubular uniball arm instead.
Weight matters here too. Every pound you add to the truck gets transferred into the suspension, and a lot of it lands on the ball joints. On a heavy build, hit one rock you didn't see and a light duty ball joint gets damaged a lot sooner.
Mistake 2: Taking it to a regular alignment shop
Most aftermarket upper control arms that aren't adjustable have the extra caster built into the arm. Hugo said ICON's, for example, give you about 2.5 to 3 degrees of caster with a good alignment. To actually get that, you need a shop that knows how to align a truck with aftermarket parts.
So skip the Firestone or anywhere that does lifetime alignments. Those are good for factory stuff. Find an off-road shop that knows how to set caster, that way your tires don't rub.
Mistake 3: Forgetting about the wheels
The JBA arms have a little lip sticking out by the ball joint. With the wrong wheel, the tire's sidewall can rub on it, especially with 35s that stick out a lot from the wheel. Hugo's recommendation for JBA was 4.5 to 5 inches of backspacing and zero offset, or a maximum of -12 offset if you don't want to do a body mount chop.
JBA makes a standard duty and a heavier duty arm, and both give you a lot of caster for tires up to a 35. One heads up: Runnin4Tacos didn't list JBA on its website when we filmed, and I didn't find it on either store's site in October 2026.
If you're still picking tires, I covered the biggest tire on a Tacoma or 4Runner without a lift.
Mistake 4: Skipping the maintenance
Every one of these needs maintenance. Higher performance parts need more of it.
- Greasable ball joints (like SPC). Give the grease zerk on top a few pumps every oil change, and use the grease the manufacturer recommends.
- Uniballs (Total Chaos, Camburg). There's a thin layer of Teflon between the ring and the ball, so keep it clean and lubricated with a dry lube like Tri-Flow, which doesn't attract dirt or mud. A lot of the "my uniballs are loud" stories come from skipping this. I spray mine every oil change, or even every couple of weeks, and it keeps them quiet.
- Polyurethane bushings. Loosen the through bolt a few turns, give it a couple pumps of grease, and stop as soon as you see the bushing move. Don't let it deform. Torque the bolt back to spec. You don't need an alignment after re-greasing.
- Adjustable arms. Keep the threads clean. If they get packed with dirt, the alignment tech has to pull the arms off to clean them, and now you're paying for a three or four hour alignment.
The good news with uniballs is they don't just fail. You'll hear them rattling in the front end first, and that's your sign it's time to replace it. A ball joint you never maintain can actually collapse and break.
Mistake 5: Picking a joint you can't replace on a trip
Dirt King uses a Moog ball joint, and the Dobinsons tubular and billet arms use a 555 ball joint. You can find both at pretty much any auto parts store. So if a joint starts failing in the middle of nowhere, you can stop and replace it. You need special tools, but it's doable.
The Dobinsons bushings are also the softest of the bunch, so they ride pretty much like factory. ICON's Delta Joints are harder to track down. You may need to call your local off-road shop ahead. If you run uniballs, Hugo keeps a little stash of extra bushings and uniballs, just in case.
What's current in 2026
The video is from 2023, so I checked both stores in October 2026. Runnin4Tacos lists SPC, ICON, Total Chaos, Camburg, Dirt King and Dobinsons arms for the 2005–2023 Tacoma. ToyTec lists SPC, ICON, Total Chaos and Dobinsons. ICON's newer kits are now Delta Joint Pro.
For the 2024+ Tacoma and 2025+ 4Runner, ToyTec lists the SPC, the ICON tubular DJ Pro and Total Chaos, and Runnin4Tacos lists ICON billet and Total Chaos arms. Check fitment for your exact year on the product page. Each code below works on that store's own site.
We put ICON tubular Delta Joint arms on a 2024 Tacoma carrying a Tune M1 camper, paired with Dobinsons IMS suspension. If you're lifting at the same time, I go through shocks in the best entry level shocks for Tacoma and 4Runner.
How it feels to drive
With an OEM style ball joint, the steering feels about the same as factory. With uniballs it's a lot tighter and more responsive, more like a race truck. It took some getting used to, but after a while I definitely liked it more.
My verdict
If you daily drive it, run bigger tires and take it easy on trails, get the SPC for the adjustability. If you want entry level strength with parts you can find anywhere, look at Dobinsons or Dirt King. If you have a heavy truck or like to hit things hard, go uniball with Total Chaos or Camburg, and keep up the maintenance. For me personally, ICON's Delta Joint is the best of both worlds: a sealed, greasable joint with the strength of a uniball.
FAQ
Why put aftermarket upper control arms on a Tacoma?
To get your alignment back to spec and fit bigger tires. Adjustable arms like SPC let the shop dial in caster and camber, and most tubular arms have extra caster built in.
SPC vs Total Chaos upper control arms?
SPC is for adjustability and a quiet ride on a daily driver. Total Chaos is a tubular uniball arm for heavier trucks and harder wheeling, and it needs more maintenance.
Are uniball upper control arms loud?
They can be if you don't lube them. Spray the uniball with a dry lube like Tri-Flow regularly. A rattle in the front end means it's time to replace it.
Can any shop align a truck with aftermarket UCAs?
No. Go to an off-road shop that works with aftermarket parts and knows how to set caster, not a shop that mostly does factory alignments.